Walker has no opinions on anything:
talkingpointsmemo.com

“I’m not president today and I can’t be president today,” Walker said when asked by ABC News about how he would address the refugee crisis. “Everybody wants to talk about hypotheticals; there is no such thing as a hypothetical.”

When asked again about Syrian refugees, Walker said that as president he would work to defeat the Islamic State, according to ABC News.

Walker has declined to opine on numerous issues during the early months of his presidential campaign. When asked about Kentucky clerk Kim Davis’ refusal to issue marriage licenses to same-sex couples, Walker’s campaign gave TPM a vague statement about gay marriage. The Wisconsin governor was also hesitant to take a clear position on birthright citizenship.

He also has no opinion on evolution. Or global warming.